This is a hard question to answer as to pick one thing would be impossable. It is best for me to say i disagree with all their teaching. I know some may say things like their teachings on morality are good, and on the face value I would agree. But lets not forget that their teaching is not so much to be moral for morallitys sake but to make the WT look good. Everything they teach is for their benefit not the individuals.
I hope that makes since